PST:EE SRC files?

According to Near Infinity the unknown dword in SRC file format is Weight, from which I assume it's possible to adjust which string has higher chance to show up. I'd like to test it if this is the case and if SRC files are also supported by other EE games, but how exactly they are used in the first place? How to call the SRC file to display string in game?

SRC files are used by the script actions FloatMessageRnd() and FloatMessageFixedRnd(). They are only available in PST and PST:EE. I don't know if there are opcodes that support SRC files. PST-specific opcodes are still not very well understood.

Imagination is more important than knowledge. Knowledge is limited; imagination encircles the world. - Albert Einstein